UNIX trick or command Post: 302991349

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pridist.d

pridist.d(1m)							   USER COMMANDS						     pridist.d(1m)

NAME

       pridist.d - process priority distribution. Uses DTrace.

SYNOPSIS

       pridist.d

DESCRIPTION

       This  is  a  simple  DTrace  script  that samples at 1000 Hz which process is on the CPUs, and what the priority is. A distribution plot is
       printed.

       With priorities, the higher the priority the better chance the process (actually, thread) has of being scheduled.

       This idea came from the script /usr/demo/dtrace/profpri.d, which produces similar output for one particular PID.

       Since this uses DTrace, only users with root privileges can run this command.

EXAMPLES

       This samples until Ctrl-C is hit.
	      # pridist.d

FIELDS

       CMD    process name

       PID    process ID

       value  process priority

       count  number of samples of at least this priority

BASED ON

       /usr/demo/dtrace/profpri.d

DOCUMENTATION

       DTrace Guide "profile Provider" chapter (docs.sun.com)

       See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
       bose descriptions explaining the output.

EXIT

       pridist.d will sample until Ctrl-C is hit.

SEE ALSO

       dispadmin(1M), dtrace(1M)

version 0.90							   Jun 13, 2005 						     pridist.d(1m)